First of all set scale by using imageJ or DM3 software(depending on type of your image), then find the distance between the two symmetric points in SAED pattern sad d1. then distance between planes will be d = 2/d1. then compare this distance to some standard peak hkl value for your sample
I have got big value. The distance between the points is around 345 (1/nm). Is any solution for it? Is any other method to find the lattice planes?
the picture you shared here cant have 345 1/nm distance because the scale (5 1/nm) is too large so how can you get 345 from this picture. 345 means the distance you measured is 69 times of the given scale which is not true in this picture you may set wrong scale I think
Since you have a scale you can measure the distances in any software really that has a measure distance tool. Make sure that you are choosing symmetric reflections and you pass through the centre.
Checking really fast your image for instance, the distance between the two spots that are in the perpendicular direction (roughly) is almost equal to your scale bar so it would be around d=0.4 nm. If you have a HRTEM image to pair that SAED you can measure also directly on the image to double check the measurements. Also you have some double spots so be careful what you choose for your symmetric reflections.
yes , I agree with Antiope Lotsari answer. the chouice should be right. points should be semmeteric and selecting line should pass through the center
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